import {
  getStrWithBrFromHtml,
  checkNodeOuter,
  focusInput,
  selectAllInput,
  htmlEscape,
  handleInputPasteText,
  checkSmmFormatData,
  getTextFromHtml
} from '../../utils'
import { ERROR_TYPES, CONSTANTS } from '../../constants/constant'

//  节点文字编辑类
export default class TextEdit {
  //  构造函数
  constructor(renderer) {
    this.renderer = renderer
    this.mindMap = renderer.mindMap
    // 当前编辑的节点
    this.currentNode = null
    // 文本编辑框
    this.textEditNode = null
    // 文本编辑框是否显示
    this.showTextEdit = false
    // 如果编辑过程中缩放画布了，那么缓存当前编辑的内容
    this.cacheEditingText = ''
    this.hasBodyMousedown = false
    this.bindEvent()
  }

  //  事件
  bindEvent() {
    this.show = this.show.bind(this)
    this.onScale = this.onScale.bind(this)
    this.onKeydown = this.onKeydown.bind(this)
    // 节点双击事件
    this.mindMap.on('node_dblclick', (node, e, isInserting) => {
      this.show({ node, e, isInserting })
    })
    // 点击事件
    this.mindMap.on('draw_click', () => {
      // 隐藏文本编辑框
      this.hideEditTextBox()
    })
    this.mindMap.on('body_mousedown', () => {
      this.hasBodyMousedown = true
    })
    this.mindMap.on('body_click', () => {
      if (!this.hasBodyMousedown) return
      this.hasBodyMousedown = false
      // 隐藏文本编辑框
      if (this.mindMap.opt.isEndNodeTextEditOnClickOuter) {
        this.hideEditTextBox()
      }
    })
    this.mindMap.on('svg_mousedown', () => {
      // 隐藏文本编辑框
      this.hideEditTextBox()
    })
    // 展开收缩按钮点击事件
    this.mindMap.on('expand_btn_click', () => {
      this.hideEditTextBox()
    })
    // 节点激活前事件
    this.mindMap.on('before_node_active', () => {
      this.hideEditTextBox()
    })
    // 鼠标滚动事件
    this.mindMap.on('mousewheel', () => {
      if (
        this.mindMap.opt.mousewheelAction === CONSTANTS.MOUSE_WHEEL_ACTION.MOVE
      ) {
        this.hideEditTextBox()
      }
    })
    // 注册编辑快捷键
    this.mindMap.keyCommand.addShortcut('F2', () => {
      if (this.renderer.activeNodeList.length <= 0) {
        return
      }
      this.show({
        node: this.renderer.activeNodeList[0]
      })
    })
    this.mindMap.on('scale', this.onScale)
    // // 监听按键事件，判断是否自动进入文本编辑模式
    if (this.mindMap.opt.enableAutoEnterTextEditWhenKeydown) {
      window.addEventListener('keydown', this.onKeydown)
    }
    this.mindMap.on('beforeDestroy', () => {
      this.unBindEvent()
    })
  }

  // 解绑事件
  unBindEvent() {
    window.removeEventListener('keydown', this.onKeydown)
  }

  // 按键事件
  onKeydown(e) {
    const activeNodeList = this.mindMap.renderer.activeNodeList
    if (activeNodeList.length <= 0 || activeNodeList.length > 1) return
    const node = activeNodeList[0]
    // 当正在输入中文或英文或数字时，如果没有按下组合键，那么自动进入文本编辑模式
    if (node && this.checkIsAutoEnterTextEditKey(e)) {
      this.show({
        node,
        e,
        isInserting: false,
        isFromKeyDown: true
      })
    }
  }

  // 判断是否是自动进入文本编模式的按钮
  checkIsAutoEnterTextEditKey(e) {
    const keyCode = e.keyCode
    return (
      (keyCode === 229 ||
        (keyCode >= 65 && keyCode <= 90) ||
        (keyCode >= 48 && keyCode <= 57)) &&
      !this.mindMap.keyCommand.hasCombinationKey(e)
    )
  }

  //  注册临时快捷键
  registerTmpShortcut() {
    // 注册回车快捷键
    this.mindMap.keyCommand.addShortcut('Enter', () => {
      this.hideEditTextBox()
    })
    this.mindMap.keyCommand.addShortcut('Tab', () => {
      this.hideEditTextBox()
    })
  }

  // 获取当前文本编辑框是否处于显示状态，也就是是否处在文本编辑状态
  isShowTextEdit() {
    if (this.mindMap.richText) {
      return this.mindMap.richText.showTextEdit
    }
    return this.showTextEdit
  }

  //  显示文本编辑框
  // isInserting：是否是刚创建的节点
  // isFromKeyDown：是否是在按键事件进入的编辑
  async show({
    node,
    isInserting = false,
    isFromKeyDown = false,
    isFromScale = false
  }) {
    // 使用了自定义节点内容那么不响应编辑事件
    if (node.isUseCustomNodeContent()) {
      return
    }
    const { beforeTextEdit } = this.mindMap.opt
    if (typeof beforeTextEdit === 'function') {
      let isShow = false
      try {
        isShow = await beforeTextEdit(node, isInserting)
      } catch (error) {
        isShow = false
        this.mindMap.opt.errorHandler(ERROR_TYPES.BEFORE_TEXT_EDIT_ERROR, error)
      }
      if (!isShow) return
    }
    this.currentNode = node
    const { offsetLeft, offsetTop } = checkNodeOuter(this.mindMap, node)
    this.mindMap.view.translateXY(offsetLeft, offsetTop)
    const rect = node._textData.node.node.getBoundingClientRect()
    const params = {
      node,
      rect,
      isInserting,
      isFromKeyDown,
      isFromScale
    }
    if (this.mindMap.richText) {
      this.mindMap.richText.showEditText(params)
      return
    }
    this.showEditTextBox(params)
  }

  // 处理画布缩放
  onScale() {
    const node = this.getCurrentEditNode()
    if (!node) return
    if (this.mindMap.richText) {
      this.mindMap.richText.cacheEditingText =
        this.mindMap.richText.getEditText()
      this.mindMap.richText.showTextEdit = false
    } else {
      this.cacheEditingText = this.getEditText()
      this.showTextEdit = false
    }
    this.show({
      node,
      isFromScale: true
    })
  }

  //  显示文本编辑框
  showEditTextBox({ node, rect, isInserting, isFromKeyDown, isFromScale }) {
    if (this.showTextEdit) return
    const { nodeTextEditZIndex, textAutoWrapWidth, selectTextOnEnterEditText } =
      this.mindMap.opt
    if (!isFromScale) {
      this.mindMap.emit('before_show_text_edit')
    }
    this.registerTmpShortcut()
    if (!this.textEditNode) {
      this.textEditNode = document.createElement('div')
      this.textEditNode.style.cssText = `position:fixed;box-sizing: border-box;background-color:#fff;box-shadow: 0 0 20px rgba(0,0,0,.5);padding: 3px 5px;margin-left: -5px;margin-top: -3px;outline: none; word-break: break-all;`
      this.textEditNode.setAttribute('contenteditable', true)
      this.textEditNode.addEventListener('keyup', e => {
        e.stopPropagation()
      })
      this.textEditNode.addEventListener('click', e => {
        e.stopPropagation()
      })
      this.textEditNode.addEventListener('mousedown', e => {
        e.stopPropagation()
      })
      this.textEditNode.addEventListener('keydown', e => {
        if (this.checkIsAutoEnterTextEditKey(e)) {
          e.stopPropagation()
        }
      })
      this.textEditNode.addEventListener('paste', e => {
        const text = e.clipboardData.getData('text')
        const { isSmm, data } = checkSmmFormatData(text)
        if (isSmm && data[0] && data[0].data) {
          // 只取第一个节点的纯文本
          handleInputPasteText(e, getTextFromHtml(data[0].data.text))
        } else {
          handleInputPasteText(e)
        }
      })
      const targetNode =
        this.mindMap.opt.customInnerElsAppendTo || document.body
      targetNode.appendChild(this.textEditNode)
    }
    let scale = this.mindMap.view.scale
    let lineHeight = node.style.merge('lineHeight')
    let fontSize = node.style.merge('fontSize')
    let textLines = (this.cacheEditingText || node.getData('text'))
      .split(/\n/gim)
      .map(item => {
        return htmlEscape(item)
      })
    let isMultiLine = node._textData.node.attr('data-ismultiLine') === 'true'
    node.style.domText(this.textEditNode, scale, isMultiLine)
    this.textEditNode.style.zIndex = nodeTextEditZIndex
    this.textEditNode.innerHTML = textLines.join('<br>')
    this.textEditNode.style.minWidth = rect.width + 10 + 'px'
    this.textEditNode.style.minHeight = rect.height + 6 + 'px'
    this.textEditNode.style.left = rect.left + 'px'
    this.textEditNode.style.top = rect.top + 'px'
    this.textEditNode.style.display = 'block'
    this.textEditNode.style.maxWidth = textAutoWrapWidth * scale + 'px'
    if (isMultiLine && lineHeight !== 1) {
      this.textEditNode.style.transform = `translateY(${
        -((lineHeight * fontSize - fontSize) / 2) * scale
      }px)`
    }
    this.showTextEdit = true
    // 选中文本
    // if (!this.cacheEditingText) {
    //   selectAllInput(this.textEditNode)
    // }
    if (isInserting || (selectTextOnEnterEditText && !isFromKeyDown)) {
      selectAllInput(this.textEditNode)
    } else {
      focusInput(this.textEditNode)
    }
    this.cacheEditingText = ''
  }

  // 删除文本编辑元素
  removeTextEditEl() {
    if (this.mindMap.richText) {
      this.mindMap.richText.removeTextEditEl()
      return
    }
    if (!this.textEditNode) return
    const targetNode = this.mindMap.opt.customInnerElsAppendTo || document.body
    targetNode.removeChild(this.textEditNode)
  }

  // 获取当前正在编辑的内容
  getEditText() {
    return getStrWithBrFromHtml(this.textEditNode.innerHTML)
  }

  //  隐藏文本编辑框
  hideEditTextBox() {
    if (this.mindMap.richText) {
      return this.mindMap.richText.hideEditText()
    }
    if (!this.showTextEdit) {
      return
    }
    this.renderer.activeNodeList.forEach(node => {
      let str = this.getEditText()
      this.mindMap.execCommand('SET_NODE_TEXT', node, str)
      if (node.isGeneralization) {
        // 概要节点
        node.generalizationBelongNode.updateGeneralization()
      }
      this.mindMap.render()
    })
    this.mindMap.emit(
      'hide_text_edit',
      this.textEditNode,
      this.renderer.activeNodeList,
      this.currentNode
    )
    this.currentNode = null
    this.textEditNode.style.display = 'none'
    this.textEditNode.innerHTML = ''
    this.textEditNode.style.fontFamily = 'inherit'
    this.textEditNode.style.fontSize = 'inherit'
    this.textEditNode.style.fontWeight = 'normal'
    this.textEditNode.style.transform = 'translateY(0)'
    this.showTextEdit = false
  }

  // 获取当前正在编辑中的节点实例
  getCurrentEditNode() {
    if (this.mindMap.richText) {
      return this.mindMap.richText.node
    }
    return this.currentNode
  }
}
